Multifunctional tooth skipping prevention guide tensioner

Abstract

The utility model discloses a multifunctional tooth skipping prevention guide tensioner which comprises an exhaust cam, an air inlet cam, a timing belt, a tensioning wheel, a guide tensioning mechanism and a crankshaft belt pulley, and the exhaust cam and the air inlet cam are arranged above the crankshaft belt pulley side by side. The timing belt is used for sequentially connecting the exhaust cam, the crankshaft belt pulley and the exhaust cam together in a transmission manner; a tensioning wheel is arranged between the exhaust cam and the crankshaft pulley and tensions the timing belt between the exhaust cam and the crankshaft pulley, a guide tensioning mechanism is arranged on the timing belt between the crankshaft pulley and the air inlet cam and comprises a base support and a guide plate, the base support is fixedly mounted in an engine, and the guide plate is fixedly mounted on the base support. One end of the guide plate is rotationally connected with the base support, the other end of the guide plate is elastically connected with the base support, the side face of the guide plate is tightly pressed on the timing belt, the guide plate and the timing belt are in multi-point rolling contact, the guide plate guides the timing belt and tensions the timing belt, and excellent tooth skipping resisting guide performance is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of engine tensioner manufacturing, and in particular relates to a multifunctional anti-tooth jump guide tensioner. Background Art

[0002] During the operation of a car engine, the four processes of intake, compression, explosion, and exhaust occur continuously in the cylinder, and the timing of each step must be coordinated with the movement state and position of the piston, so that the intake and exhaust and the lifting and lowering of the piston are coordinated with each other. The timing belt plays the role of a "bridge" in the engine, and transmits power to the corresponding parts under the drive of the crankshaft. The distance between the crankshaft and the intake cam on the timing belt is relatively long. Generally, an idler wheel is set between the two to tighten the belt. The idler wheel can assist the tensioner wheel in guiding the belt so that the timing belt can be transmitted stably. However, there is a single-point contact between the idler wheel and the belt. Due to the influence of space and distance, the tightness of the belt cannot be controlled. In particular, when the engine stops, it will cause the engine to reverse, which can easily cause the belt that has just been turned out from the crankshaft to jump teeth, eventually leading to timing confusion and engine damage. Utility Model Content

[0003] In view of the above problems and technical requirements, the utility model provides a multifunctional anti-tooth jumping guide tensioner, which can replace the idler wheel to tension and guide the timing belt, has excellent anti-tooth jumping performance, and can avoid damage to the timing belt caused by tooth jumping.

[0004] The technical scheme of the utility model is as follows: a multifunctional anti-tooth jumping guide tensioner, comprising an exhaust cam, an intake cam, a timing belt, a tensioner, a guide tensioning mechanism and a crankshaft pulley, wherein the exhaust cam and the intake cam are arranged side by side above the crankshaft pulley, and the timing belt drives and connects the exhaust cam, the crankshaft pulley and the exhaust cam in sequence; a tensioner is provided between the exhaust cam and the crankshaft pulley, and the tensioner tensions the timing belt between the exhaust cam and the crankshaft pulley, and a guide tensioning mechanism is provided on the timing belt between the crankshaft pulley and the intake cam, and the guide tensioning mechanism comprises a base bracket and a guide plate, the base bracket is fixedly installed in the engine, one end of the guide plate is rotatably connected to the base bracket, and the other end is elastically connected to the base bracket, the side of the guide plate is pressed against the timing belt, and there is multi-point rolling contact between the guide plate and the timing belt, and the guide plate guides the timing belt to tension the timing belt. This solution uses a guide plate to support and guide the timing belt. Compared with the single-point support of the traditional idler pulley, the multi-point rolling contact support of the guide plate has a more stable support effect, can reduce the vibration of the belt and improve the operating stability.

[0005] Furthermore, the base bracket includes a rotating shaft, a first support arm and a second support arm, the first support arm and the second support arm respectively extend outward from the outside of the rotating shaft to form a V shape, the angle formed by the ends of the first support arm and the second support arm and the center of the rotating shaft is greater than 90 degrees, the end of the first support arm is rotatably connected to the upper end of the guide plate, the lower end of the guide plate hangs down on the end of the second support arm, and a tensioner is fixedly installed on the end of the second support arm, the front end of the tensioner points to the inner side of the guide plate, and the tensioner and the inner side of the guide plate are elastically abutted and connected. The V-shaped base bracket uses a guide plate to support and guide the belt. Compared with the roller support, it has the advantages of small size and large support surface, will not interfere with the operation of other parts, and has better support stability.

[0006] Furthermore, the outer side of the guide plate contacts the timing belt, and the outer side of the guide plate is provided with two outwardly protruding arc surfaces along its length, and the connection between the two arc surfaces is recessed inward, and a plurality of roller bearings parallel to each other are provided on the two arc surfaces. When the outer side of the guide plate presses the timing belt, the plurality of roller bearings roll in contact with the timing belt. The two arc surfaces simultaneously support the timing belt, and the high points of the two arc surfaces can tighten the timing belt, so that the belt surface and as many roller bearings on the arc surfaces as possible come into contact, and the more contact points, the better the support stability, and the more stable the guide plate's control of the belt.

[0007] Furthermore, the tail of the tensioner is fixedly connected to the second support arm through two screw holes, and a spring column is provided at the front end of the tensioner, the spring column abuts against the inner side of the guide plate, and the spring column moves telescopically under the tension of the timing belt. The spring column presses the guide plate tightly, so that the guide plate can press the timing belt inward, and when the belt suddenly relaxes and tightens, it is timely tightened inward or relaxed outward, so that the timing belt runs stably and is not easy to jump teeth or get stuck.

[0008] Furthermore, the rotating shaft, the first support arm and the second support arm of the base bracket are integrally formed, an engine mounting hole is provided at the center of the rotating shaft, the engine mounting hole fixes the base bracket in the engine, and a hexagonal blind hole is provided at the core of the front side of the rotating shaft. The hexagonal blind hole facilitates the rotation and adjustment operation of the base bracket.

[0009] Furthermore, a positioning pin protruding outward is provided on the back of the rotating shaft, and the distance between the positioning pin and the center of the rotating shaft is greater than the distance between the positioning pin and the edge of the rotating shaft. The positioning pin cooperates with the engine mounting hole to position and install the base bracket into the engine, so that the base bracket remains fixed.

[0010] Compared with the prior art, the beneficial effects of the utility model are: 1) two arc surfaces are provided on the outer side surface of the guide plate of the guide tensioning mechanism, and a row of roller bearings are provided on the arc surface, so that the contact surface between the guide plate and the timing belt forms a multi-point rolling contact surface. Compared with a single arc surface, the two arc surfaces have a better effect of extending the contact, and the supporting force of the guide plate on the timing belt is greatly improved. The timing belt is not prone to vibration and the operation is more stable; 2) A tensioner is provided at the end of the second support arm of the base bracket, so that the guide plate can swing around the upper end of the guide plate under the elastic support of the tensioner, so as to realize the tightness control of the timing belt. Even if the engine formal system suddenly stops, the timing belt on this side will be tightened in real time, and the belt between the crankshaft pulley and the intake cam will not jump teeth due to sudden relaxation. Therefore, it has excellent anti-jumping tooth performance and can reduce the abnormal belt noise caused by the vibration of the timing belt. The whole system runs more quietly and with higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a gear train tensioning connection structure of the engine timing system in the utility model;

[0012] Figure 2 This is a front structural diagram of the utility model multifunctional anti-jump tooth guide tensioner;

[0013] Figure 3 This is a back structural diagram of the utility model multifunctional anti-jump tooth guide tensioner;

[0014] Figure 4 This is a structural diagram of the guide plate in the utility model;

[0015] Marked in the figure are: exhaust cam 1, crankshaft pulley 2, intake cam 3, timing belt 4, tensioner 5, guide tensioning mechanism 6, base bracket 7, rotating shaft 71, engine mounting hole 711, hexagonal blind hole 712, locating pin 713, first support arm 72, second support arm 73, tensioner 8, spring column 81, guide plate 9, roller bearing 91. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] like Figure 1-4The utility model is shown as a multifunctional anti-tooth jumping guide tensioner, comprising an exhaust cam 1, an intake cam 3, a timing belt 4, a tensioner 5, a guide tensioning mechanism 6 and a crankshaft pulley 2, wherein the exhaust cam 1 and the intake cam 3 are arranged side by side above the crankshaft pulley 2, and the timing belt 4 drives and connects the exhaust cam 1, the crankshaft pulley 2 and the exhaust cam 1 in sequence; a tensioner 5 is provided between the exhaust cam 1 and the crankshaft pulley 2, and the tensioner 5 tensions the timing belt 4 between the exhaust cam 1 and the crankshaft pulley 2, and a guide tensioning mechanism 6 is provided on the timing belt 4 between the crankshaft pulley 2 and the intake cam 3.

[0018] The guide tensioning mechanism 6 includes a base bracket 7 and a guide plate 9. The base bracket 7 is fixedly installed in the engine. One end of the guide plate 9 is rotatably connected to the base bracket 7, and the other end is elastically connected to the base bracket 7. The side of the guide plate 9 is pressed against the timing belt 4. There is multi-point rolling contact between the guide plate 9 and the timing belt 4. The guide plate 9 guides the timing belt 4 to tension the timing belt 4.

[0019] The base bracket 7 comprises a rotating shaft 71, a first supporting arm 72 and a second supporting arm 73, the first supporting arm 72 and the second supporting arm 73 respectively extend outward from the outside of the rotating shaft 71 to form a V-shape, and the angle formed between the ends of the first supporting arm 72 and the second supporting arm 73 and the center of the rotating shaft 71 is greater than 90 degrees; the rotating shaft 71, the first supporting arm 72 and the second supporting arm 73 of the base bracket 7 are integrally formed parts, an engine mounting hole 711 is provided at the center of the rotating shaft 71, the engine mounting hole 711 fixes the base bracket 7 in the engine, and a hexagonal blind hole 712 is provided at the core of the front of the rotating shaft 71, and the hexagonal blind hole 712 facilitates the rotation and adjustment operation of the base bracket 7. A positioning pin 713 protruding outward is provided on the back of the rotating shaft 71, and the distance between the positioning pin 713 and the center of the rotating shaft is greater than the distance between the positioning pin and the edge of the rotating shaft. The positioning pin 713 cooperates with the engine mounting hole 711 to position and install the base bracket 7 in the engine, so that the base bracket 7 remains fixed.

[0020] The end of the first support arm 72 is rotatably connected to the upper end of the guide plate 9, and the lower end of the guide plate 9 hangs down to the end of the second support arm 73. The end of the second support arm 73 is fixedly installed with a tensioner 8, and the front end of the tensioner 8 points to the inner side of the guide plate. The tensioner 8 and the inner side of the guide plate 9 are elastically abutted and connected. The V-shaped base bracket 7 uses the guide plate 9 to support and guide the belt. Compared with the roller support, it has the advantages of small volume and large support surface, will not interfere with the operation of other parts, and has better support stability. The tail of the tensioner 8 is fixedly connected to the second support arm 73 through two screw holes. The front end of the tensioner 8 is provided with a spring column 81, which abuts against the inner side of the guide plate 9. The spring column 81 is subjected to the tensioning force of the timing belt 4 and moves in a telescopic manner. The spring column 81 presses the guide plate 9 tightly, so that the guide plate 9 can press the timing belt 4 inwardly. When the belt is suddenly loose and tight, it is timely tensioned inward or relaxed outward, so that the timing belt 4 runs stably and is not easy to jump teeth or get stuck.

[0021] The outer side of the guide plate 9 contacts the timing belt 4. The outer side of the guide plate 9 is provided with two outwardly protruding arc surfaces along its length. The connection between the two arc surfaces is recessed inward. The two arc surfaces are provided with multiple roller bearings 91 parallel to each other. When the outer side of the guide plate presses the timing belt 4, the multiple roller bearings 91 roll in contact with the timing belt 4. The two arc surfaces support the timing belt 4 at the same time. The high points of the two arc surfaces can tighten the timing belt 4, so that the belt surface and as many roller bearings 91 on the arc surface as possible come into contact. The more contact points, the better the support stability, and the more stable the control of the belt by the guide plate 9.

[0022] The working principle of the utility model is as follows: the base bracket 7 is fixedly installed between the crankshaft pulley 2 and the intake cam 3, so that the guide plate 9 can be pressed on the timing belt 4 from the outside, and the multiple roller bearings 91 on the guide plate 9 are in contact with the timing belt 4. When the timing belt 4 is transmitted, it rolls and rubs against the multiple roller bearings 91, and the roller bearings 91 support the timing belt 4 to run smoothly; the spring column 81 of the tensioner 8 forms an elastic support facing the guide plate 9 on the inner side of the guide plate, and the spring column 81 is moved by the tensioning force of the timing belt to perform telescopic movement. When the timing system suddenly stops, the timing belt 4 between the crankshaft pulley 2 and the intake cam 3 suddenly becomes loose, and the tensioner 8 can push the guide plate 9 forward in real time, and the guide plate 9 supplements the tensioning force of the belt, so that the timing belt 4 will not be loose, and the timing belt 4 rotated from the crankshaft pulley 2 will not be loose or jump teeth, thereby ensuring the stable operation of the system.

[0023] The above are only several preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes and substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multifunctional anti-jump tooth guide tensioner, characterized in that: It includes an exhaust cam, an intake cam, a timing belt, a tensioner, a guide tensioning mechanism and a crankshaft pulley, wherein the exhaust cam and the intake cam are arranged side by side above the crankshaft pulley, and the timing belt drives and connects the exhaust cam, the crankshaft pulley and the exhaust cam in sequence; a tensioner is provided between the exhaust cam and the crankshaft pulley, and the tensioner tensions the timing belt between the exhaust cam and the crankshaft pulley, and a guide tensioning mechanism is provided on the timing belt between the crankshaft pulley and the intake cam, and the guide tensioning mechanism includes a base bracket and a guide plate, and the base bracket is fixedly installed in the engine, one end of the guide plate is rotatably connected to the base bracket, and the other end is elastically connected to the base bracket, the side of the guide plate is pressed against the timing belt, and there is multi-point rolling contact between the guide plate and the timing belt, and the guide plate guides the timing belt to tension the timing belt.

2. The multifunctional anti-jump tooth guide tensioner according to claim 1, characterized in that: The base bracket includes a rotating shaft, a first support arm and a second support arm. The first support arm and the second support arm extend outward from the outside of the rotating shaft to form a V shape. The angle formed by the ends of the first support arm and the second support arm and the center of the rotating shaft is greater than 90 degrees. The end of the first support arm is rotatably connected to the upper end of the guide plate, and the lower end of the guide plate hangs down to the end of the second support arm. A tensioner is fixedly installed on the end of the second support arm, and the front end of the tensioner points to the inner side of the guide plate. The tensioner and the inner side of the guide plate are elastically abutted and connected.

3. The multifunctional anti-jump tooth guide tensioner according to claim 2, characterized in that: The outer side surface of the guide plate is in contact with the timing belt. The outer side surface of the guide plate is provided with two arc surfaces protruding outward along its length. The connection between the two arc surfaces is recessed inward. A plurality of roller bearings parallel to each other are provided on the two arc surfaces. When the outer side surface of the guide plate presses the timing belt, the plurality of roller bearings are in rolling contact with the timing belt.

4. The multifunctional anti-jump tooth guide tensioner according to claim 3, characterized in that: The rear end of the tensioner is fixedly connected to the second support arm through two screw holes. A spring column is arranged at the front end of the tensioner. The spring column abuts against the inner side of the guide plate. The spring column moves telescopically under the tension of the timing belt.

5. The multifunctional anti-jump tooth guide tensioner according to claim 4, characterized in that: The rotating shaft, the first support arm and the second support arm of the base bracket are integrally formed parts. An engine mounting hole is provided at the center of the rotating shaft. The engine mounting hole fixes the base bracket in the engine. A hexagonal blind hole is provided at the core of the front side of the rotating shaft.

6. The multifunctional anti-jump tooth guide tensioner according to claim 5, characterized in that: A positioning pin protruding outward is provided on the back of the rotating shaft, and the distance from the positioning pin to the center of the rotating shaft is greater than the distance from the positioning pin to the edge of the rotating shaft.

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